Abstract

We examined the instanton contribution to the QCD con gurations generated
from lattice QCD for NF = 0, NF = 2 + 1 and NF = 2 + 1 + 1 dynamical quark
avors
from two di erent and complementary approaches. First via the use of Gradient
ow, we
computed instanton liquid properties using an algorithm to localize instantons in the gauge
eld con gurations and studied their evolution with
ow time. Then, the analysis of the
running at low momenta of gluon Green's functions serves as an independent con rmation
of the instanton density which can also be derived without the use of the Gradient
ow.

Abstract

We examined the instanton contribution to the QCD con gurations generated
from lattice QCD for NF = 0, NF = 2 + 1 and NF = 2 + 1 + 1 dynamical quark
avors
from two di erent and complementary approaches. First via the use of Gradient
ow, we
computed instanton liquid properties using an algorithm to localize instantons in the gauge
eld con gurations and studied their evolution with
ow time. Then, the analysis of the
running at low momenta of gluon Green's functions serves as an independent con rmation
of the instanton density which can also be derived without the use of the Gradient
ow.